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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.6/2 = 120/x // - 120/x
2.6/2-(120/x) = 0
2.6/2-120*x^-1 = 0
-120*x^-1 = -1.3 // : -120
x^-1 = 0.01083333
-1 < 0
1/(x^1) = 0.01083333 // * x^1
1 = 0.01083333*x^1 // : 0.01083333
92.30772071 = x^1
x = 92.30772071
x = 92.30772071
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